| Sumario: | Three studies investigating differences in response rate to mail surveys are reported. Employees of a large manufacturing company completed job-attitude surveys. Study 1 contrasted response rates for four surveys sent to 4,991 employees, representing all members of two populations, with rates for four similar surveys sent to 2,156 employees, representing systematic samples of two comparable populations. Study 2 contrasted rates of response in three populations from 1,906 employees who received a follow-up reminder with three populations from 3,525 employees who received no follow-up. Study 3 contrasted rates of response of 2,547 employees--half receiving a postcard requesting an immediate participation commitment and half receiving no postcard. Significantly greater response occurred with (a) sampling, (b) follow-ups, and (c) precommitted participation on postcards.
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